package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;


import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;


public class RefreshTokenInterceptor implements HandlerInterceptor {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            //说明没有登录，直接放行
            return true;
        }
        // 2.基于token获取redis中的用户
        //返回一个map，entries
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().
                entries(LOGIN_USER_KEY + token);
        //3.判断用户是否存在
        if(userMap.isEmpty()){
            return true;
        }
        // 5.将查询到的hash数据再转为userDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //6.存在保存用户信息在threadlocal
        UserHolder.saveUser(userDTO);

        // 7.刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token,30, TimeUnit.MINUTES);
        //8.放行
        return true;

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
